In chemistry, amounts of substances are measured in moles.
One mole of any substance is just the amount of that substance that contains an Avagadro number of particles - so 6.02 x 10^23 particles.
The mass of one mole of atoms or molecules of any substance is exactly the same number of grams as the relative atomic mass or relative formula mass.
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Limiting Reactants
The reaction stops when all of one of the reactants is used up.
Any other reactants are in excess.
They're usually added in excess to make sure that the other reactant is completely used up. The reactant that's used up in a reaction is called the limiting reactant (because it limits the amount of product that's formed).
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